Superheater steam boiler



sept. 26, 1933. w, A. JNES v1,927,892

SUPERHEATER STEAM BOILER Filed July 12, 1952 's sheets-sheet 1 INVENTOR Sept. 26, 1933. w. A. JoNEs SUPERHEATER STEAM BOILER 3 Sheets-Sheet 2 l Filed July 12. 1932 INVENTOR Sept. 26, 1933. w. A. JONES SUPERHEATER STEAM BOILER 3 Sheets-Sheet 5 Filed Ju'ly. 12, 1932 a o, 0 lo 2 1 P ../c' .w16 H, 6 .6 n. s@ a n||\ uur.. i .u a a s 3 7 0 u l. 4 s a HH a 2 Ib.. .2. 'b1/v M 4 m 40m 444 n .m l F INVENTOR Patented Sept. 26, 1933l SUPERHEATER STEAM oILER y William Anthony Jones, WestNew'Brighton,

Application July 12, 1932. serial Nd. 622,070

- 3 claims. (o1. 122-479) My invention utilizes change in temperature for controlling a motive power for moving plates of superheater tubes between plates of boiler tubes into hotter or cooler gases to automatically 5 maintain a nearly constant outlet temperature-or" superheated steamior momentary variations in boiler ratings.

This invention differs from that described in United States Patent No. 1,855,915, issued to me April 26, 1932, in that it uses a separate motive power to move the plates of corrugated super- Y.

heater tubes, supplementing the motion due to the expansion of the superheater tubes themselves, and doing away with the `limitations in 151 dimensions which are imposed when the expansion of the superheater outlet tube itself does all of the work. T.n some cases the added complication of a separate motive power will be justied by space conditions and the like. 2 The use of a separate motive power also per mits the cooler inlet steam to be in the tubes which are surrounded by the hottest gasesv instead of requiring that the hotter outlet steam be in the tubes surrounded by the hottest gases and this results in somewhat less maximum temperature o i metal of the tube, doing away with the necessity of using expensive special alloy steel in some cases.

Evidently the separate motive power, for moving the plates of superheater tubes, may be a reversible electric motor controlled vby the temperature of the outlet steam.

'Ihe separate motive power may also bea hydraulic cylinder or a corrugated sheet metal bag, actuated by pressure of water in a closed -vessel in contact with the superheated steam, but for high temperatures the resulting water pressure would be very high and such an arrangement does not permit of easy adjustment. Any leakage would be fatal. l.

Because feed water at a pressure higher than the boiler steam pressure is always available it seems most convenient tov use a hydraulic cylinder actuated by feed water pressure and discharging spent water into the boiler and the par- Fig. 3 is a part cross sectionv throughvzboile-r tubes and superheater tubes on line BB of Fig-` ure 1.

Fig. 4 and Fig. 5 sectional side `views `respectively of the hydraulic operating cylinder and voperating valve shown in Fig. 1.. l Fig. 6 is similar to Fig. '1 but ar 1anged for the inlet steam to bein the tube which'gis surrounded by the hottest gases. Like reference characters indicate likeparts in the several views. v

Fig. 1 shows a superheaterv having plates of tubes with'a tube for receiving radiant-heat in m series with tubes for receiving heat by convec-v tion, the latter corrugated where-they occur-beare enlarged part planand l fr i,

tween boiler tubesv so that they can movewith respectto the boiler-tubes as describdin United' States Patent, 1,855,915,

steam to be in the tube surrounded by the hottest gases,

In this case, at the temperature for whichl itis adjusted, the heat operated valve admits'feed water to the hydraulic cylinder, thus moving the superheater tubes into coole'rgases. v l,

Fig. 6 lshows a superheaterwith the hydraulic operating 'cylinder' andvalve arranged forthe cooler inlet steam to bein the superheater tubes that are surrounded by; the hottestgases. In this case'the heat operated Valve discharges water from the hydraulic cylinder` tothe -boilenthus lowering the forward box and moving-the superheater tubes into cooler gases.

In the boiler shown, which I have chosen for purposes of illustration, the steamfdrums, 1, 2, and3, areconnected to mud drum, 4, by banks of tubes, 7, 8, and 9. v, Y

Steam drums, 1 and 2, are connected bytubes, 5, below thefwater line and by tubes, 6,1' above the water line;

The furnace for source theboiler tubes, 7, and gases ,ilow insuccession between boiler tubes, 7,5, and9, with or without ballies.

Saturated steam .is supplied by drum, 3,

through tube, 10, to superheater inlet box,.11.

Superheated steam isgdischarged from superheater outlet box, 12. f

Plates of superheatertubes `connect'theinlet withoutj 'materially ,(5. changing 'the gas flow vareas and it shows va hydraulic cylinder for imparting a .mot ic`mtto1the of heat is infontofv cof box, 11, to the outlet box, 12, and occupy spaces between the boiler tubes, 5, 6, and 7.

As shown each plate of superheater tubes includes, in series, a down flow tube, 13, supplying saturated steam, several lengths of corrugated tubes, 14,'34, and 36, for receiving heat by convection, a length of tube, 15, for receiving radiant heat, and an upflow tube, 16, for conducting superheated steam to the outlet box, 12. y

Outlet box, 12, is held by inverted U bolts, 17, cross pieces, 18, and nuts, 19, above supporting beams, 20, represented as resting above drums',

1 and 2.

As represented, adjustment of nuts, 19, ipermits box, 12, to be raised or lowered andadjustment of screw, 44, permits box, 11, to be'lowered orraised, causing plates of superheater tubes to swing towards or away from the fire. Point, 21, may move to point, 25.

Seals, 22, form gas closures where tubes, 13 and y16, pass through gas closure, 23, above tube, 5.

Tubes of each plate will ordinarily be tied together by welding at points, 24, to give ystructural strength to the plate of tubes as a whole. Fig'. 2 and Fig. 3, show maximum and minimum gas ilow areasbetween boiler tubes and plates of superheatervftubes Evidently as plates of superheater tubesmove with respect to the boiler tubes, the gas passage areas shown in Fig. 2 and Fig. 3 will occur at different planes along the length of the tubes, maintaining a nearly constant total gaspassage area.

. Evidently, tube, 15, and tube, 36, could be eliminatedv and tube, 16, connected to tube, .34, at point, 35, doing away with the radiant superg heater tube if desired. f Fig- 4and Fig. 5, show the hydraulic operating cylinder, 40, packing gland, 41, piston, 42, slotted to receive transverse beam, 43, which supports superheater inlet box, 11. Screw, 44, operated by hand wheel, 45, determines the 'height of the inlet box, 11, above the piston,"42, and affordsV a convenient means of manually raising and lowering this box thus causing the superheater tubes to move into cooler or hotter gases, independent of their automatic motion.

Expansion of tubes, 16, by the heat lowers lugs,

56, and through roller, 57, lowers the short end of lever, 52, raising its long end.

Hand wheel, 58, operatesdiiferential screw, 54, 55, engaging trunnion nut, 53, whereby the long end of lever, 52, may be brought as near to the stem of valve, v49, asis necessary to open this valve for a given height of lugs, 56, as determined by the desired temperature. Increasing the clearance between lever,` 52, and valve stem, 49, causes the valverto open at a higher temperature of steamcausing a greater expansion of tube, 16.

vAs shown in Fig. 4 and Fig. 5, Valve, 49,'k when open admits feed water through throttle valve, l50, and Vpasasge way, 47, to cylinder, 40, raising thesuperheater inlet box, 11, and causing the superheater tubes to move into cooler gases, giving less superheat to the steam.

Valve, 51, at all times, slowly discharges water from the hydraulic cylinder to the boiler drum,

the piston and the superheater box, 11, to rise, at a speeddetermined by the opening of valve, 50, as compared with the opening of valve, 51.

The use of the differential screw permits .a very fine adjustment of the height of the trunnion nut, 53, and thereby of the long end of the lever, 52. For linstance if the upper screw, 55, has eleven threads per inch and the lower screw, 54, has ten threads per inch, both right hand threads, then the effective pitch is the same as one hundred and 'ten threads per inch right hand.

A spring, 46, is shown for closing valve, 49,'

against the pressure in this case.

Fig. 6, shows the same arrangement oi' hy-v draulic cylinder and thermostatic valve adapted for use where the coolest steam enters the superheater 'tube which is surrounded by the hottest gases.

In this case valve, 51', permits a limited flow of feed water to cylinder, 49', at all times, and valve, 50', permits a free iiow from the hydraulic cylinder, 40', to the boiler drum, 2, when valve, 49', is opened by the expansion of the superheater outlet tube, 16', kthus lowering the superheater inlet box, which is the forward box in this case, and this in turn causes the superheater tubes to move into cooler gases. Y

When valve, 49', closes, the pres/sure slowly risesin the cylinder, 40', causing the superheater tubes to again move into hotter gases.

In operation all valves will permitaslight flow of vfeed water to the boiler and the action will be independent of slight leaks. Valves should be of small size to permit of proper adjustment.

The apparatus described may be varied without departing from my invention; One'or both boxes may be placed below the superheater instead of above the superheater, and still function as described. Attachment may be made tovmove the superheater tubes independent of the boxes if desired without departing from my invention.

The Asuperheater may be used with a boiler having curved tubes or straight tubes. Only a slight adjustment ofV one of the boxes will ordinarily be required and the connecting tubes will readily spring enough to permit this without being over strained and without flexible-joints.

The superheater should be in the mean position when saturated tubes, 10, are connected so that maximum stress due to distortion will be that due to one half of the total motion.

Saturated tubes, 10, may be given a horizontal transverse offset at, 60, to increase their exibility.

IV claim; y,

1. In combination, a row of spaced steam generating tubes, a superheater comprising tubes eX- tending substantially parallel with the generating tubes and between the spaces thereof, inlet and outlet headers for the superheater, a jack arranged with respect to one of the headers so as to move the header in a direction to cause a lateral movement of the superheater tubes with respect to the generating tubes, a lug attached to an outlet portion Aof one of the superheater tubes, a lever pivoted in fixed relation with the outlet header and having a portion contacting with said lug, a control device for controlling the position of the jack and arranged to be operated by said lever in a manner to cause the superheater tubes to be moved rearwardly of the generating tubes upon an increase in length of the outlet portion of the superheater tube.

2. In combination, a row of spaced steam generating tubes, a superheater comprising tubes ex tending between the spaces of the generating tubes, inlet and outlet headers for the superheater, a jack arranged with respect to one'of the headers so as to move the header in a direction to cause a lateral'rnovement of the superheater tubes with respect tothe generating tubes, a lug attached to an outlet portion of one ofthe superheater tubes', a lever pivoted in adjustably fixed relation with the outlet header and having a portion contacting With said lug, a control device for controlling the position of the jack and arranged to be operated by said lever in a manner to cause the superheater tubes to be moved rearwardly of the generating tubes upon a definite increase in length of the outlet portion of the superheater tube.

3. In combination, a row of spaced steam generating tubes, a superheater comprising tubes extending betweenfthe spaces of the generating tubes, inlet and outlet headers for the super-v heater, a jack arrangedwith respect to one of the headers so as to move the header in a direc-r tion-to cause a lateral movement of the superl:so

heater tubes with respect to the generating tubes, A

a lug attached to the outlet portion'of onerof the superheater tubes, a lever pivoted in adjustably xed relation with the outlet header and having a portion contacting with said lug, a control de-V vice for controlling the motion of the jack and arranged to be operated by said lever in a manner 

